Schedule II - Valuation and Qualifying Accounts (Details) (Allowance Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance Accounts
Movement in Valuation Allowances and Reserves
Balance at the beginning of the year	$ 43,740	$ 129,505	$ 58,911
Additions
Amounts Charged Against Operations, net	13,316	8,519	79,346
Acquired Properties	2
Deductions
Uncollectible Accounts Written-off	(4,673)	(93,858)	(8,504)
Disposed Properties	(3,176)	(426)	(248)
Balance at the end of the year	$ 49,209	$ 43,740	$ 129,505

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- Definition

This element represents deductions to the valuation and qualifying accounts with respect to disposed or contributed properties.

+ References

No definition available.

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- Definition

This element represents additions to the valuation and qualifying accounts with respect to acquired properties.

+ References

No definition available.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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